I said distro instead OS, Linux is the most used OS,
Wrong, Linux totals 3% of the desktop market which is what’s being discussed in the original post.
many people behind working in secure the Linux environment.
Many people work on securing Windows so your point is…?
The example of this exploit also exists on Mac and Windows for years, and it will always happen.
Whataboutism.
An admin user will know what they are doing, and I doubt they will install a package from an external source downloaded randomly on internet, for the non-admin users, without sudo they can’t install/infect that malware on your Linux.
Wrong. This is so wrong. The most common and effective attacks start with phishing people who think they know better. A user downloading a zip or rar file is enough, they don’t need to be an admin or have sudo rights.
Seriously just stop talking about a topic you have zero knowledge on. I suggest you do a SANS course if you’re actually interested in learning.